/*

This file is part of Ext JS 4

Copyright (c) 2011 Sencha Inc

Contact:  http://www.sencha.com/contact

Commercial Usage
Licensees holding valid commercial licenses may use this file in accordance with the Commercial Software License Agreement provided with the Software or, alternatively, in accordance with the terms contained in a written agreement between you and Sencha.

If you are unsure which license is appropriate for your use, please contact the sales department at http://www.sencha.com/contact.

*/
Ext.require([
    'Ext.util.History',
    'Ext.tab.Panel'
]);

Ext.onReady(function() {
    // The only requirement for this to work is that you must have a hidden field and
    // an iframe available in the page with ids corresponding to Ext.History.fieldId
    // and Ext.History.iframeId.  See history.html for an example.
    Ext.History.init();

    // Needed if you want to handle history for multiple components in the same page.
    // Should be something that won't be in component ids.
    var tokenDelimiter = ':';
    
    function onTabChange(tabPanel, tab) {
        var tabs = [],
            ownerCt = tabPanel.ownerCt, 
            oldToken, newToken;

        tabs.push(tab.id);
        tabs.push(tabPanel.id);

        while (ownerCt && ownerCt.is('tabpanel')) {
            tabs.push(ownerCt.id);
            ownerCt = ownerCt.ownerCt;
        }
        
        newToken = tabs.reverse().join(tokenDelimiter);
        
        oldToken = Ext.History.getToken();
       
        if (oldToken === null || oldToken.search(newToken) === -1) {
            Ext.History.add(newToken);
        }
    }
    
    // Handle this change event in order to restore the UI to the appropriate history state
    function onAfterRender() {
        Ext.History.on('change', function(token) {
            var parts, tabPanel, length, i;
            
            if (token) {
                parts = token.split(tokenDelimiter);
                length = parts.length;
                
                // setActiveTab in all nested tabs
                for (i = 0; i < length - 1; i++) {
                    Ext.getCmp(parts[i]).setActiveTab(Ext.getCmp(parts[i + 1]));
                }
            }
        });
        
        // This is the initial default state.  Necessary if you navigate starting from the
        // page without any existing history token params and go back to the start state.
        var activeTab1 = Ext.getCmp('main-tabs').getActiveTab(),
            activeTab2 = activeTab1.getActiveTab();
            
        onTabChange(activeTab1, activeTab2);
    }
    
    Ext.create('Ext.TabPanel', {
        renderTo: Ext.getBody(),
        id: 'main-tabs',
        height: 300,
        width: 600,
        activeTab: 0,
        defaults: {
            padding: 10
        },
        
        items: [{
            xtype: 'tabpanel',
            title: 'Tab 1',
            id: 'tab1',
            activeTab: 0,
            padding: 5,
            border: true,
            plain: true,
            
            defaults: {
                padding: 10
            },

            items: [{
                title: 'Sub-tab 1',
                id: 'subtab1',
                html: 'Sub-tab 1 content'
            },{
                title: 'Sub-tab 2',
                id: 'subtab2',
                html: 'Sub-tab 2 content'
            },{
                title: 'Sub-tab 3',
                id: 'subtab3',
                html: 'Sub-tab 3 content'
            }],
            
            listeners: {
                tabchange: onTabChange
            }
        },{
            title: 'Tab 2',
            id: 'tab2',
            html: 'Tab 2 content'
        },{
            title: 'Tab 3',
            id: 'tab3',
            html: 'Tab 3 content'
        },{
            title: 'Tab 4',
            id: 'tab4',
            html: 'Tab 4 content'
        },{
            title: 'Tab 5',
            id: 'tab5',
            html: 'Tab 5 content'
        }],
        listeners: {
            tabchange: onTabChange,
            afterrender: onAfterRender 
        }
    });
});
